Wipe off as much of the gel stain as possible with a cloth soaked in paint thinner.
Sand the wood with 100-grit sandpaper until is has a uniform surface. Use a sanding block to sand flat areas. Roughening the surface with open up the pores of the wood so that the stain will soak in faster.
Paint the wood with a sealer intended for use with a gel stain. Paint with the grain of the wood.
Allow the sealer to dry for several hours.
Sand the surface with 220-grit sandpaper or sanding block to smooth out the surface.
Apply the gel stain to the wood with a clean cloth, using a circular motion to work the stain into the wood.
Wait several minutes before wiping off the excess gel stain with another clean cloth. This leaves a thin layer of stain on the wood.